Bently 330850-50-00

Technical Specifications

• Part Number: 330850-50-00
• Technology Type: Piezoelectric velocity transducer (absolute measurement)
• Measurement Parameter: Vibration velocity (RMS); optional acceleration and displacement outputs
• Measurement Range: 0 to 50 mm/s RMS (0 to 1.9685 in/s RMS)
• Frequency Response: 2 Hz to 1,000 Hz (±3 dB)
• Sensitivity: 100 mV/(mm/s) RMS (2.54 mV/(in/s) RMS) at 159 Hz
• Output Signal: Differential voltage (balanced output); 0–5 V DC proportional to velocity (optional)
• Supply Voltage: 18–32 V DC (nominal 24 V DC)
• Power Consumption: ≤ 2 W at 24 V DC
• Operating Temperature Range: -40 °C to +120 °C (-40 °F to +248 °F)
• Storage Temperature Range: -55 °C to +150 °C (-67 °F to +302 °F)
• Mechanical Construction: Housing: Nickel-plated aluminum (hermetically sealed)
• Sensing Element: Piezoelectric crystal with seismic mass
• Cable: 3-meter shielded twisted pair (FEP insulation, stainless steel armor optional)

Function Features

• Absolute Vibration Measurement: Operates as an absolute transducer, measuring vibration relative to a fixed reference (not dependent on shaft material). This eliminates the need for conductive targets, making it suitable for non-ferromagnetic shafts (e.g., aluminum, composite) and equipment where proximity transducers are impractical.
• Wide Measurement Range & Frequency Response: The 0–50 mm/s RMS range and 2–1,000 Hz frequency coverage accommodate diverse machinery, from slow-speed reciprocating compressors (2–10 Hz) to high-speed centrifugal pumps (100–1,000 Hz). It captures both low-frequency structural vibration and high-frequency component wear.
• Hermetic Sealing for Extreme Environments: The IP68 rating and hermetically sealed nickel-plated aluminum housing ensure operation in submersible conditions, high humidity, and dusty industrial settings (e.g., mining, cement plants). It resists corrosion from chemicals and industrial fluids, maintaining performance in harsh environments.
• Stable Sensitivity & Low Drift: The piezoelectric crystal sensing element delivers consistent 100 mV/(mm/s) sensitivity with minimal temperature-induced drift. This ensures accurate measurements across the entire operating temperature range, avoiding false alarms or missed anomalies.
• Balanced Output for Noise Immunity: The differential balanced output design rejects electromagnetic interference (EMI) and radio frequency interference (RFI) from nearby power cables, motors, and control systems. This ensures clean, reliable signals even in high-electrical-noise industrial environments.
• Flexible Integration: Compatible with Bently Nevada 3300 XL monitoring racks, transmitters, and data acquisition systems. It also supports integration with third-party DCS, SCADA, and predictive maintenance software via standard analog outputs, adapting to existing industrial control architectures.
• Robust Mechanical Design: Withstands 500 g peak shock, making it durable for applications with high mechanical stress (e.g., reciprocating engines, mining crushers). The rugged housing and reinforced cable connection prevent damage from physical impact or cable tugging during installation and operation.
• Multi-Parameter Capability: Optional signal conditioning allows conversion of velocity data to acceleration (g) or displacement (mm) outputs, providing versatile monitoring options for different machinery health metrics without requiring additional transducers.

Application Scenarios

• Power Generation: Installed on steam turbines, gas turbines, and boiler feedwater pumps in thermal and nuclear power plants. It monitors bearing vibration to detect issues like misalignment, lubrication failure, or rotor imbalance, preventing catastrophic equipment failure and power outages.
• Oil & Gas Production: Deployed on reciprocating compressors, drilling rig motors, and wellhead pumps in upstream operations. The absolute measurement capability works with non-ferromagnetic components, while the IP68 rating withstands harsh field conditions (rain, dust, oil exposure).
• Refining & Petrochemical: Used to monitor catalytic reformers, distillation column pumps, and gearboxes in refineries. It resists exposure to hydrocarbons and solvents, providing reliable vibration data for equipment handling flammable and corrosive materials.
• Mining & Minerals Processing: Applied to crushers, grinding mills, and conveyor system motors. The robust shock resistance and dustproof design withstand the high-impact, high-dust environment of mining operations, ensuring continuous monitoring of critical production equipment.
• Cement & Aggregates: Installed on kiln drives, ball mills, and fan motors in cement plants. It operates reliably in high-temperature, dusty conditions, tracking vibration to prevent unplanned downtime in continuous-production processes.
• Marine & Offshore: Used in ship propulsion systems, offshore platform compressors, and subsea pumps. The IP68 rating allows submersible operation, while the corrosion-resistant housing withstands saltwater exposure.
• Chemical & Pharmaceutical Manufacturing: Monitors mixers, agitators, and centrifuges in chemical reactors and pharmaceutical production lines. The hermetic sealing prevents contamination, complying with strict hygiene and safety standards.
• Water & Wastewater Treatment: Deployed on large centrifugal pumps and blowers in treatment facilities. The submersible IP68 rating handles wet environments, while the wide frequency range captures vibration from slow-speed pumps to high-speed blowers.